B04AF - Understanding Common in 2016-2020 Ford Explorer and Fusion

Quick Answer

B04AF means: B04AF indicates a communication issue with the body control module, affecting vehicle lighting.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with B04AF? Address promptly to avoid further electrical issues.

Common Questions

What does B04AF mean and how does it affect my car?

B04AF indicates a communication issue with the body control module, which is responsible for managing various electrical systems in your vehicle. This can lead to malfunctioning lights, unresponsive electronics, and potential safety hazards, impacting your driving experience.

What are the most common causes of B04AF and how much does it cost to fix?

The most common causes of B04AF include a faulty body control module (60% likelihood) and wiring issues (25%). Repairing these can cost anywhere from $100 to $800 depending on the extent of the damage and parts involved.

Can I drive my car with B04AF or should I stop immediately?

While you might be able to drive the vehicle, it is advisable to address the B04AF code promptly. Ignoring it can lead to more significant electrical issues or safety risks, especially if lights or electronic features fail unexpectedly.

How can I diagnose B04AF myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view live data, and check freeze frame information. Start by connecting the app to your vehicle's OBD2 port, retrieve the codes, and analyze the data to identify any anomalies related to the body control module.

What vehicles are most commonly affected by B04AF?

DTC B04AF is particularly common in 2016-2020 Ford models such as the Explorer and Fusion. Owners of these vehicles should be vigilant for symptoms related to electrical systems and lighting.

How can I prevent B04AF from happening again?

Regular maintenance, including checking and cleaning electrical connections, ensuring water does not enter the wiring harness, and keeping the body control module updated with the latest software can help prevent issues related to B04AF.

What is B04AF?

The diagnostic trouble code (DTC) B04AF generally indicates a fault with the vehicle’s body control module or the communication between various electronic modules in your car. This code is often associated with issues in the vehicle's lighting system, including the interior lights or exterior lamps. When the B04AF code is triggered, it may lead to symptoms like malfunctioning lights or the vehicle's electronics behaving erratically. Drivers might notice that certain lights do not turn on or off as expected, which can affect overall vehicle safety. In most vehicles, particularly those manufactured by Ford between 2016 and 2020, this code can result from a failing sensor or a wiring issue in the body control module. Addressing this code promptly is crucial because it can lead to further complications if left unresolved, including increased electrical load on the battery and potential malfunctions in other systems. Regular diagnostics using tools like the GeekOBD APP can help identify the issue before it escalates, ensuring your vehicle runs smoothly and safely.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B04AF is present:

  • Check engine light stays on constantly, indicating an ongoing issue with the vehicle's electrical system.
  • Interior lights flicker or do not turn on, creating an inconvenience and safety concern when entering or exiting the vehicle.
  • Exterior lights malfunction, such as turn signals or brake lights not working, which can lead to safety hazards while driving.
  • Unresponsive electronic features, such as power windows or door locks, which may indicate broader electrical issues.
  • Battery drains unexpectedly, which can be a sign that there’s a continuous electrical draw due to the fault.

Possible Causes

Most common causes of B04AF (ordered by frequency):

  1. Faulty body control module is the most common cause, occurring in about 60% of cases. This module manages electronic functions, and if it fails, it can trigger code B04AF.
  2. Wiring issues, such as frayed or shorted wires, can lead to a 25% likelihood of this code being set. Corrosion or damage to the wiring harness can disrupt communication.
  3. Defective sensors, particularly those related to interior lighting, may account for about 10% of cases. Regular checks can prevent these from triggering the code.
  4. Less common causes include software glitches within the vehicle's ECU, which may require a software update or re-flash.
  5. Rarely, a failing battery can create issues in the electrical system, leading to intermittent faults that trigger the B04AF code.

B04AF Repair Costs

Cost Breakdown by Repair Type

Body Control Module Replacement

Replacing the faulty body control module to restore proper communication and functionality.

  • Total: $300 - $800
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wires that may be causing the communication issues.

  • Total: $100 - $300
  • Success rate: 85%
Money-Saving Tips for B04AF
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional B04AF Diagnosis Process

Follow these systematic steps to accurately diagnose B04AF. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components related to the body control module (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components related to the body control module (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation of all affected systems after repairs and clear codes (10-15 minutes)

Step 4: System function test - Verify proper operation of all affected systems after repairs and clear codes (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the code doesn’t return (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the code doesn’t return (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Body Control Module Replacement in 2018 Ford Explorer

Vehicle: 2018 Ford Explorer, 45,000 miles

Problem: Customer reported flickering interior lights and intermittent power door lock failures.

Diagnosis: Using the GeekOBD APP, we retrieved the B04AF code and found the body control module was unresponsive.

Solution: Replaced the body control module and verified proper function of all electronic systems post-repair.

Cost: $600 (parts $450, labor $150)

Result: Customer reported all systems functioning correctly with no reoccurrence of the code.

Case Study 2: Wiring Repair on 2019 Ford Fusion

Vehicle: 2019 Ford Fusion, 30,000 miles

Problem: Owner experienced issues with exterior lights not functioning properly.

Diagnosis: After scanning with the GeekOBD APP, the B04AF code was present due to a short circuit in the wiring harness.

Solution: Repaired the damaged wiring and ensured all connections were secure.

Cost: $200 (parts $50, labor $150)

Result: Exterior lights functioned correctly after repair, and no further issues detected.

Diagnose B04AF

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: B04AF
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: MEDIUM
Category: Body Codes